INJECTION DEVICE
First Claim
1. Apparatus for receipt and injection of a liquid specimen in quantities as small as 10 2 to 10 6 milliliters with high accuracy and precision comprising the combination of a resilient tubular member and a reciprocable plunger, the forward end of which is adapted for receipt of a liquid specimen, which can be extended through the tubular opening of the said resilient tubular member into contact with the liquid to be sampled for receipt of a measured amount of the liquid specimen, and then withdrawn so that unmeasured liquid is wiped from the external surface of the forward end of the plunger.
1 Assignment
0 Petitions
Accused Products
Abstract
In combination, liquid injection apparatus comprising a tubular plastic member, e.g., Teflon, through the internal tubular opening of which the forward end of a reciprocable plunger, adapted for receipt of a specimen, can be extended into contact with, and for receipt of, a liquid to be sampled. Upon withdrawal of the forward end of the plunger through the tubular opening, with which the plunger surface is in wiping contact, a measured quantity of the liquid specimen is transmitted therethrough for storage or for injection, while unmeasured liquid is wiped off of, and removed from, the surface of the plunger. In preferred embodiments, the forward end of the reciprocable plunger itself is recessed or provided with an internal capillary opening of measured capacity for containing the measured liquid specimen, and in another a longitudinal slot, or slots, located within the internal opening of the tubular plastic member leaves an accurately measured, or measurable, streak of liquid on the surface of the plunger for storage or injection.
13 Citations
10 Claims
- 1. Apparatus for receipt and injection of a liquid specimen in quantities as small as 10 2 to 10 6 milliliters with high accuracy and precision comprising the combination of a resilient tubular member and a reciprocable plunger, the forward end of which is adapted for receipt of a liquid specimen, which can be extended through the tubular opening of the said resilient tubular member into contact with the liquid to be sampled for receipt of a measured amount of the liquid specimen, and then withdrawn so that unmeasured liquid is wiped from the external surface of the forward end of the plunger.
Specification